Abstract
This paper treats the vibration characteristics of three different types of asymmetric buildings and investigates the feasibility of applying an innovative vibration-based multicriteria approach-based damage index (MCA-DI) technique to detect the damage. This technique combines a modified form of the traditional modal strain energy method (MSEM) developed by decomposing the mode shapes into lateral and vertical components together with a modified form of the modal flexibility method to define a new damage indicator. Lastly, the dynamic behavior of three asymmetric building instances, including a 10-storey L-shaped structure, a 10-storey setback structure, and a 6-storey reinforced concrete structure with an unsymmetrical distribution of columns, was studied under five different damage scenarios. The results showed that despite different vibration characteristics of these three asymmetric buildings, the proposed method was able to accurately and effectively locate all damages and eliminate the confusion when more than one index is simultaneously used by using only the first a few modes.
Highlights
Advances in analytical techniques, modern construction technologies, and aesthetic needs have resulted in the massive construction of large-scale and complex building structures
Asymmetry in buildings is represented by eccentricity in geometry, stiffness, or mass, which may have a large impact on the dynamic response of the building as torsion is generated under lateral loads [1]. e change in the dynamic response depends on the type of structural irregularity
Different types of asymmetries can result in significant differences in the dynamic response of asymmetric buildings and their vibration characteristics, which can pose a challenge in using the traditional vibrationbased methods to detect damage in them. ere is a need for a simple and reliable procedure to detect and locate such damage in all types of asymmetric buildings, so that appropriate retrofitting can be carried out to prevent structural failure
Summary
Modern construction technologies, and aesthetic needs have resulted in the massive construction of large-scale and complex building structures. Different types of asymmetries can result in significant differences in the dynamic response of asymmetric buildings and their vibration characteristics, which can pose a challenge in using the traditional vibrationbased methods to detect damage in them. Damage of structures in the area of civil engineering was assessed by visual inspection (VI) techniques or Nondestructive Testing (NDT) techniques such as X-ray and ultrasonic waves to measure cracks and permanent deformations [3] Major drawbacks of these methods are that damaged regions are needed to be readily accessible and the collected data are insufficient to predict the remaining life of the structure. E applications in the above structures have been successful in the last decades It is still a challenge for civil engineers to identify the damage in complex structures such as 3D asymmetric buildings. This paper only considered buildings with mass eccentricity, which may not represent all types of asymmetric buildings. is paper, treats the damage detection in three typical types of asymmetric building structures, which are more complex and have strong irregularities in the plan and in the elevation using the proposed MCA-DI method, and more damage scenarios have been considered, the capability of the proposed method is tested with noise effect and incomplete mode shape, thereby establishes the capability of MCA-DI to detect damage in most asymmetric buildings
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